Question about 2002 Cadillac Deville

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No problem the service engine light is on and I am told it reads torque converter

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darryljf

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Sounds like P0741 code. Run a self diagnostic. If this is your code, it will likely trigger the check engine light when you're driving at around 80 km/h (overdrive fails). If you're still running, your torque converter clutch is probably stuck on. The fix require the tranny to be opened up and a solenoid changed (14 - 20hrs labour). If you can live with the light coming on and slightly worse fuel economy, then let it be. Make sure you check the codes yourself to be sure. And get it serviced if you notice any change in the way she drives.

Posted on Feb 01, 2011

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Thats what transfers power from the engine to the transmission have it checked before you get stranded some place

Posted on Sep 18, 2010

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P0743 - Torque Converter Clutch Circuit Electrical
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- Torque converter clutch solenoid valve harness or connectors
- Torque converter clutch solenoid valve circuit is open or shorted
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1998 jeep grand cherokee 4x4. have the p0740 code. have to start from neutral, then shifts faily well. May start fluttering and making noise, have to put back to N, then to D and once again will shift. ...


P0740 JEEP - Torque Converter Clutch Circuit
Symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
- Transmission shift shock
- Vehicle may not shift into the highest gear

Possible causes
- Low transmission fluid level
- Dirty transmission fluid
- Faulty torque converter clutch solenoid valve
- Torque converter clutch solenoid valve harness or connectors
- Torque converter clutch solenoid valve circuit is open or shorted

When is the code detected?
Torque Converter Clutch (TCC) unlocked for 10 sec., ECM commands converter lock-up and did not record engine speed drop.

P0740 JEEP Description
The torque converter clutch solenoid valve is activated, with the gear in D4, by the Transmission Control Module (TCM) in response to signals sent from the vehicle speed and the Engine Control Module (ECM). Lock-up piston operation will then be controlled. When the torque converter clutch solenoid valve is activated, the torque converter lockup clutch will engage creating a 1 to 1 RPM ratio between the transmission input shaft and the rotational speed of the torque converter.

Lock-up operation, however, is prohibited when A/T fluid temperature is too low.

When the accelerator pedal is depressed (less than 2/8) in lock-up condition, the engine speed should not change abruptly. If there is a big jump in engine speed, there is no lock-up.

I’m happy to help further over the phone at https://www.6ya.com/expert/jeremy_69f3cc28d95bf514

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Check engine light/torque converter


Blades inside a torque converter do "open and close" based on engine rpm, and they may not be working correctly. However, they should have given you the error code (DTC) which would tell you exactly what was going on. In any case, if you have a torque converter internal problem, it is almost always necessary to replace it as it does not contain any serviceable parts. If it has been a very long time since the transmission fluid was replaced, I would try that first because if you don't, a serious transmission failure is on the horizon.

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